   <nz-select    style="width: 200px;margin-left: 4rem;" nzPlaceHolder="请选择迄今为止的天数" [(ngModel)]="Mode" (ngModelChange)="getData(Mode)">
      <nz-option *ngFor="let option of listOfOption" [nzLabel]="option.label" [nzValue]="option.value">
              </nz-option>
       </nz-select>
    
<div>
   <nz-spin [nzTip]="'正在读取数据...'" style="position: absolute;top: 15%;left: 45%;" [nzSpinning]="isSpinning">
    </nz-spin>
    <v-chart [forceFit]="forceFit" [height]="height" [data]="data" [scale]="scale">
      <v-tooltip></v-tooltip>
      <v-axis></v-axis>
      <v-legend></v-legend>
      <v-smooth-line position="time*temperature" color="city" shape="smooth"></v-smooth-line>
      <v-point position="time*temperature" color="city" shape="circle"></v-point>
    </v-chart>
  </div>

    